text: import numpy as np
  
  
  ASDF_MAGIC = b'#ASDF'
  BLOCK_MAGIC = b'\xd3BLK'
  FITS_MAGIC = b'SIMPLE'
  
  BLOCK_HEADER_BOILERPLATE_SIZE = 6
  
  ASDF_STANDARD_COMMENT = b'ASDF_STANDARD'
  
  INDEX_HEADER = b'#ASDF BLOCK INDEX'
  
  # The maximum number of blocks supported
  MAX_BLOCKS = 2 ** 16
  MAX_BLOCKS_DIGITS = int(np.ceil(np.log10(MAX_BLOCKS) + 1))
  
  YAML_TAG_PREFIX = 'tag:yaml.org,2002:'
  YAML_END_MARKER_REGEX = br'\r?\n\.\.\.((\r?\n)|$)'
  
  
  STSCI_SCHEMA_URI_BASE = 'http://stsci.edu/schemas/'
  STSCI_SCHEMA_TAG_BASE = 'tag:stsci.edu:asdf'
  
  
  BLOCK_FLAG_STREAMED = 0x1
  
  # All arrays shorter than this default to inline storage.
  DEFAULT_AUTO_INLINE = 100
  
  # ASDF max number size
  MAX_BITS = 63
  MAX_NUMBER = (1<<MAX_BITS) - 1
  MIN_NUMBER = -((1<<MAX_BITS) - 2)
  